107668381721 has 2 divisors, whose sum is σ = 107668381722. Its totient is φ = 107668381720.

The previous prime is 107668381703. The next prime is 107668381921. The reversal of 107668381721 is 127183866701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57386598025 + 50281783696 = 239555^2 + 224236^2 .

It is an emirp because it is prime and its reverse (127183866701) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-107668381721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 107668381721.

It is not a weakly prime, because it can be changed into another prime (107668381921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53834190860 + 53834190861.

It is an arithmetic number, because the mean of its divisors is an integer number (53834190861).

Almost surely, 2^107668381721 is an apocalyptic number.

It is an amenable number.

107668381721 is a deficient number, since it is larger than the sum of its proper divisors (1).

107668381721 is an equidigital number, since it uses as much as digits as its factorization.

107668381721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 107668381721 in words is "one hundred seven billion, six hundred sixty-eight million, three hundred eighty-one thousand, seven hundred twenty-one".